runtime: remove unused memlimit function

Change-Id: Id057dcc85d64e5c670710fbab6cacd4b906cf594
Reviewed-on: https://go-review.googlesource.com/93655
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/runtime/os3_solaris.go

@@ -223,37 +223,6 @@ func unminit() {
 	unminitSignals()
 }
 
-func memlimit() uintptr {
-	/*
-		TODO: Convert to Go when something actually uses the result.
-		Rlimit rl;
-		extern byte runtime·text[], runtime·end[];
-		uintptr used;
-
-		if(runtime·getrlimit(RLIMIT_AS, &rl) != 0)
-			return 0;
-		if(rl.rlim_cur >= 0x7fffffff)
-			return 0;
-
-		// Estimate our VM footprint excluding the heap.
-		// Not an exact science: use size of binary plus
-		// some room for thread stacks.
-		used = runtime·end - runtime·text + (64<<20);
-		if(used >= rl.rlim_cur)
-			return 0;
-
-		// If there's not at least 16 MB left, we're probably
-		// not going to be able to do much. Treat as no limit.
-		rl.rlim_cur -= used;
-		if(rl.rlim_cur < (16<<20))
-			return 0;
-
-		return rl.rlim_cur - used;
-	*/
-
-	return 0
-}
-
 func sigtramp()
 
 //go:nosplit

src/runtime/os_darwin.go

@@ -483,14 +483,6 @@ func osyield() {
 	usleep(1)
 }
 
-func memlimit() uintptr {
-	// NOTE(rsc): Could use getrlimit here,
-	// like on FreeBSD or Linux, but Darwin doesn't enforce
-	// ulimit -v, so it's unclear why we'd try to stay within
-	// the limit.
-	return 0
-}
-
 const (
 	_NSIG        = 32
 	_SI_USER     = 0 /* empirically true, but not what headers say */

src/runtime/os_dragonfly.go

@@ -193,37 +193,6 @@ func unminit() {
 	unminitSignals()
 }
 
-func memlimit() uintptr {
-	/*
-		                TODO: Convert to Go when something actually uses the result.
-
-				Rlimit rl;
-				extern byte runtime·text[], runtime·end[];
-				uintptr used;
-
-				if(runtime·getrlimit(RLIMIT_AS, &rl) != 0)
-					return 0;
-				if(rl.rlim_cur >= 0x7fffffff)
-					return 0;
-
-				// Estimate our VM footprint excluding the heap.
-				// Not an exact science: use size of binary plus
-				// some room for thread stacks.
-				used = runtime·end - runtime·text + (64<<20);
-				if(used >= rl.rlim_cur)
-					return 0;
-
-				// If there's not at least 16 MB left, we're probably
-				// not going to be able to do much. Treat as no limit.
-				rl.rlim_cur -= used;
-				if(rl.rlim_cur < (16<<20))
-					return 0;
-
-				return rl.rlim_cur - used;
-	*/
-	return 0
-}
-
 func sigtramp()
 
 type sigactiont struct {

src/runtime/os_freebsd.go

@@ -266,37 +266,6 @@ func unminit() {
 	unminitSignals()
 }
 
-func memlimit() uintptr {
-	/*
-		TODO: Convert to Go when something actually uses the result.
-		Rlimit rl;
-		extern byte runtime·text[], runtime·end[];
-		uintptr used;
-
-		if(runtime·getrlimit(RLIMIT_AS, &rl) != 0)
-			return 0;
-		if(rl.rlim_cur >= 0x7fffffff)
-			return 0;
-
-		// Estimate our VM footprint excluding the heap.
-		// Not an exact science: use size of binary plus
-		// some room for thread stacks.
-		used = runtime·end - runtime·text + (64<<20);
-		if(used >= rl.rlim_cur)
-			return 0;
-
-		// If there's not at least 16 MB left, we're probably
-		// not going to be able to do much. Treat as no limit.
-		rl.rlim_cur -= used;
-		if(rl.rlim_cur < (16<<20))
-			return 0;
-
-		return rl.rlim_cur - used;
-	*/
-
-	return 0
-}
-
 func sigtramp()
 
 type sigactiont struct {

src/runtime/os_linux.go

@@ -324,38 +324,6 @@ func unminit() {
 	unminitSignals()
 }
 
-func memlimit() uintptr {
-	/*
-		TODO: Convert to Go when something actually uses the result.
-
-		Rlimit rl;
-		extern byte runtime·text[], runtime·end[];
-		uintptr used;
-
-		if(runtime·getrlimit(RLIMIT_AS, &rl) != 0)
-			return 0;
-		if(rl.rlim_cur >= 0x7fffffff)
-			return 0;
-
-		// Estimate our VM footprint excluding the heap.
-		// Not an exact science: use size of binary plus
-		// some room for thread stacks.
-		used = runtime·end - runtime·text + (64<<20);
-		if(used >= rl.rlim_cur)
-			return 0;
-
-		// If there's not at least 16 MB left, we're probably
-		// not going to be able to do much. Treat as no limit.
-		rl.rlim_cur -= used;
-		if(rl.rlim_cur < (16<<20))
-			return 0;
-
-		return rl.rlim_cur - used;
-	*/
-
-	return 0
-}
-
 //#ifdef GOARCH_386
 //#define sa_handler k_sa_handler
 //#endif

src/runtime/os_nacl.go

@@ -246,10 +246,6 @@ func semawakeup(mp *m) {
 	})
 }
 
-func memlimit() uintptr {
-	return 0
-}
-
 // This runs on a foreign stack, without an m or a g. No stack split.
 //go:nosplit
 //go:norace

src/runtime/os_netbsd.go

@@ -272,10 +272,6 @@ func unminit() {
 	unminitSignals()
 }
 
-func memlimit() uintptr {
-	return 0
-}
-
 func sigtramp()
 
 type sigactiont struct {

src/runtime/os_openbsd.go

@@ -226,10 +226,6 @@ func unminit() {
 	unminitSignals()
 }
 
-func memlimit() uintptr {
-	return 0
-}
-
 func sigtramp()
 
 type sigactiont struct {

src/runtime/os_plan9.go

@@ -466,10 +466,6 @@ func write(fd uintptr, buf unsafe.Pointer, n int32) int64 {
 	return int64(pwrite(int32(fd), buf, n, -1))
 }
 
-func memlimit() uint64 {
-	return 0
-}
-
 var _badsignal = []byte("runtime: signal received on thread not created by Go.\n")
 
 // This runs on a foreign stack, without an m or a g. No stack split.

src/runtime/os_windows.go

@@ -885,7 +885,3 @@ func setThreadCPUProfiler(hz int32) {
 	stdcall6(_SetWaitableTimer, profiletimer, uintptr(unsafe.Pointer(&due)), uintptr(ms), 0, 0, 0)
 	atomic.Store((*uint32)(unsafe.Pointer(&getg().m.profilehz)), uint32(hz))
 }
-
-func memlimit() uintptr {
-	return 0
-}